We did Egypt in January and Kenya/Tanzania last August.
Egypt, I was in Egypt in December 1985 and didn't have any cold temps like we had this January. The cruise ships and hotels didn't have central heat and we were chilled, especially at night and early morning, late evening.
Take a WARM jacket with gloves and hat to protect yourself from the sun. The sun is brutal.
Didn't have a bug problem in Egypt.
Kenya/Tanzania
Even though we were near the Equator, the altitude was high enough for us to encounter chilly weather. Still, our hotels had heat.
Don't take dark clothing. We took anti-malaria meds before going and during our safari. Also, we go the yellow fever vaccine and hepatitis vaccine for two types of hepatitis. Also, updated other vaccines.
We took bug repellant and used it some. In some places bugs weren't bad.
Take clothing with layers. I took long sleeve safari shirts that I purchased at a sporting goods store. Also, safari trousers. Safari clothing was light weight and had several pockets for items.
My wife had a great safari hat with a misquito net that she could deploy if needed. I had a safari hat as well. (not a baseball hat).